Characterization of free volume and density gradients of polystyrene surfaces by low-energy positron lifetime measurements

Polymer ◽  
2004 ◽  
Vol 45 (13) ◽  
pp. 4533-4539 ◽  
Author(s):  
John Algers ◽  
Ryoichi Suzuki ◽  
Toshiyuki Ohdaira ◽  
Frans H.J. Maurer
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Low Energy ◽  
Density Gradients ◽  
Lifetime Measurements

Free Volume and Density Gradients of Amorphous Polymer Surfaces As Determined by Use of a Pulsed Low-Energy Positron Lifetime Beam and PVT Data

2004 ◽  
Vol 37 (11) ◽  
pp. 4201-4210 ◽  
Author(s):  
John Algers ◽  
Ryoichi Suzuki ◽  
Toshiyuki Ohdaira ◽  
Frans H. J. Maurer
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Amorphous Polymer ◽  
Low Energy ◽  
Polymer Surfaces ◽  
Density Gradients ◽  
Pvt Data

scholarly journals Study of interfaces in polymer-metal oxide films and free-volume hole using low-energy positron lifetime measurements

2019 ◽  
Vol 4 (3) ◽  
pp. 413-419 ◽  
Author(s):  
Aman Deep Acharya ◽  
Bhawna Sarwan ◽  
Ratnesh Sharma ◽  
S.B. Shrivastava ◽  
Manoj Kumar Rathore
Keyword(s):  
Metal Oxide ◽  
Free Volume ◽  
Positron Lifetime ◽  
Oxide Films ◽  
Low Energy ◽  
Metal Oxide Films ◽  
Lifetime Measurements ◽  
Polymer Metal ◽  
Free Volume Hole

scholarly journals POSITRON LIFETIME MEASUREMENTS IN NATURAL RUBBER WITH DIFFERENT FILLERS

2013 ◽  
Vol 22 ◽  
pp. 112-117 ◽  
Author(s):  
A. MANDAL ◽  
S. MUKHERJEE ◽  
S. PAN ◽  
A. SENGUPTA
Keyword(s):  
Natural Rubber ◽  
Positron Annihilation ◽  
Free Volume ◽  
Positron Lifetime ◽  
Amorphous Region ◽  
Filler Concentration ◽  
Lifetime Measurements ◽  
Positron Annihilation Lifetime

Positron annihilation lifetime spectra (PLAS) have been measured for natural rubber polymer with different fillers (Titenium dioxide, Nanosilica and Nanoclay) as a function of filler concentration to investigate how these fillers affect the microstructure of free volume of natural rubber. The lifetime spectra is analyzed by using LT9.0 and the longest lived component(τo-Ps) is attributed to the pick- off annihilation of o-Ps in free volume sites, available mostly in the amorphous region of polymer. On the basis of the τo-Ps values the radii of the free volume holes (Rh) are calculated. The PALS results show that o-Ps lifetime as well as the size of free volume decreases with the increase of filler concentration.

Defect Characterization Of InAs Wafers Using Positron Lifetime Spectroscopy

1996 ◽  
Vol 442 ◽  
Author(s):  
J. Mahony ◽  
P. Mascher
Keyword(s):  
Carrier Concentration ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Positron Lifetime ◽  
Defect Characterization ◽  
Lifetime Measurements ◽  
Positron Lifetime Spectroscopy ◽  
Heavily Doped

AbstractPositron lifetime measurements on InAs wafers have shown that the positron bulk lifetime in InAs is 246±2 ps. Most samples exhibit a defect lifetime of 287±6 ps, which is attributable to monovacancy-impurity complexes with a concentration of 7±2×10 16 cm-3. Very heavily doped n-type samples exhibit a defect lifetime of 332–340 ps, characteristic of divacancies. The concentration of these defects is also close to 1017 cm−3. Both types of defects are stable for rapid thermal annealing up to 850 °C, and both defects are neutral. The formation of the divacancytype defects may be correlated with a discrepancy between the carrier concentration and the total

Free Volume Determination of Azobenzene−PMMA Copolymer by a Pulsed Low-Energy Positron Lifetime Beam with in-Situ UV Illumination

2004 ◽  
Vol 37 (21) ◽  
pp. 8035-8042 ◽  
Author(s):  
John Algers ◽  
Peter Sperr ◽  
Werner Egger ◽  
Laszlo Liszkay ◽  
Gottfried Kögel ◽  
...  
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Low Energy ◽  
Volume Determination ◽  
Uv Illumination

The Absolute Free Volume Fraction in Polymers from the Positron Lifetime Measurements

2001 ◽  
Vol 363-365 ◽  
pp. 269-271 ◽  
Author(s):  
Jozef Krištiak ◽  
P. Bandžuch ◽  
O. Šauša ◽  
J. Zrubcová ◽  
Josef Bartoš
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Volume Fraction ◽  
Lifetime Measurements ◽  
Free Volume Fraction ◽  
The Absolute
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